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<div>Hi Daniel,</div>
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<div>Thanks for the link; that&#8217;s exactly what I was looking for. I&#8217;ll dig through this and see about adding TX support (I agree that addpath-tx-all-paths is the easiest place to start, and that&#8217;s probably all I&#8217;ll need for the moment.)&nbsp;</div>
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<div>It&#8217;ll probably be about a month before I start on coding; I&#8217;ll definitely ping you if I come up with any questions on add_path. Thanks again!</div>
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<div>Seth</div>
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<span style="font-weight:bold">From: </span>Daniel Walton &lt;<a href="mailto:dwalton@cumulusnetworks.com">dwalton@cumulusnetworks.com</a>&gt;<br>
<span style="font-weight:bold">Date: </span>Friday, April 17, 2015 at 10:43 AM<br>
<span style="font-weight:bold">To: </span>Seth Hetu &lt;<a href="mailto:shetu@akamai.com">shetu@akamai.com</a>&gt;<br>
<span style="font-weight:bold">Cc: </span>&quot;<a href="mailto:quagga-dev@lists.quagga.net">quagga-dev@lists.quagga.net</a>&quot; &lt;<a href="mailto:quagga-dev@lists.quagga.net">quagga-dev@lists.quagga.net</a>&gt;<br>
<span style="font-weight:bold">Subject: </span>Re: [quagga-dev 12145] Checking in on BGP add_path<br>
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<div dir="ltr">Hi Seth,
<div>I added support for RX but have not had time to work on TX.&nbsp; The patch for RX is here:</div>
<div><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_CumulusNetworks_quagga_commit_72cac5bc18552051c44a7f9363a9627faca62e58&amp;d=AwMFaQ&amp;c=96ZbZZcaMF4w0F4jpN6LZg&amp;r=dFtjB4CNUTozJq_F3IVPgQ&amp;m=Iz4wX8h30haLCSJPuQzqQq5fuKmyR2L8XHbL_cRvdOI&amp;s=6fCF5zRNdz359we8VBPBZ5tWEMBLnuASlurnIvlFvAc&amp;e=">https://github.com/CumulusNetworks/quagga/commit/72cac5bc18552051c44a7f9363a9627faca62e58</a><br>
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<div>We just pushed this to our github repo about 5 minutes ago so none of the maintainers have looked at this yet.</div>
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<div>If you want to tackle TX support that would be great :) &nbsp;One thing to think about is that by default when you implement addpath TX, BGP will not send any additional paths.&nbsp; You need to implement some feature that uses addpath that determines what additional
paths to TX.&nbsp; Some examples:</div>
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<li>neighbor x.x.x.x addpath-tx-all-paths - Maybe you have some collector that you want to feed all of the routes to<br>
</li><li>neighbor x.x.x.x addpath-tx-bestpath-per-nexthop - Handy for RR scenario where you want to let all of the RRCs know one path for each nexthop</li><li>neighbor x.x.x.x addpath-tx-bestpath-per-neighbor-as - Can be used to stop MED oscillation</li></ul>
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<div>The &quot;all-paths&quot; one is probably the easiest to start with as the latter ones require changes to bestpath to make it calculate the bestpath per nexthop and bestpath per neighbor-as.</div>
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<div>I am one of the authors of the add-path draft so feel free to ping me if you have any questions.</div>
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<div>Daniel</div>
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<div class="gmail_quote">On Fri, Apr 17, 2015 at 10:07 AM, Hetu, Seth <span dir="ltr">
&lt;<a href="mailto:shetu@akamai.com" target="_blank">shetu@akamai.com</a>&gt;</span> wrote:<br>
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<div>Good morning all,</div>
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<div>I just wanted to get a discussion started on the BGP add_path extension (<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dietf-2Didr-2Dadd-2Dpaths-2D10&amp;d=AwMFaQ&amp;c=96ZbZZcaMF4w0F4jpN6LZg&amp;r=dFtjB4CNUTozJq_F3IVPgQ&amp;m=Iz4wX8h30haLCSJPuQzqQq5fuKmyR2L8XHbL_cRvdOI&amp;s=juhLqS-80_Q1BqT390k4TIN69Q7u7lcTo8X-PNKBxWg&amp;e=" target="_blank">https://tools.ietf.org/html/draft-ietf-idr-add-paths-10</a>).</div>
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<div>In particular, I found a Quagga-dev email from late 2014 that states Quagga does not currently support it, and was wondering if anyone is planning on working on this, or has a test implementation (in a branch somewhere) I can look at.</div>
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<div>If not, this is something I would be interested in adding some time over the next few months, as it relates directly to my job. I&#8217;ve got approval from my employer to open source all changes, so I figured I&#8217;d contact the Quagga list first to see what the
preferred way is to make this change. As I understand it, the change is simple but quite pervasive, as it affects the storage format of many message types.&nbsp;</div>
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<div>If this is not something you guys are interested in, that&#8217;s fine too. Either way, would like to hear your thoughts.</div>
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<div>Seth</div>
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